Gulp.js TypeError：需要使用glob模式字符串(Gulp.js TypeError: glob pattern string required)

 我正在按照这个教程在Ubuntu上设置gulp.js。 但是，当我在终端运行gulp styles ，出现'TypeError：glob pattern string required'错误。 我是一个完整的吞咽小吃 - 任何人都可以指向正确的方向吗？ 
 
 我的gulpfile.js文件： 
 
var gulp = require('gulp'),
    sass = require('gulp-ruby-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    minifycss = require('gulp-minify-css'),
    rename = require('gulp-rename');

gulp.task('styles', function() {
  return gulp.src('sass/*.scss')
    .pipe(sass({ style: 'expanded' }))
    .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1'))
    .pipe(gulp.dest('css'))
    .pipe(rename({suffix: '.min'}))
    .pipe(minifycss())
    .pipe(gulp.dest('css'));
});
 
 我的文件目录： 
 
  
 
 编辑： 
 
 我在我的gulp.js文件中试过这个： 
 
gulp.task('styles', function () {
    return sass('sass/*.scss', {
      style: 'expanded'
    })
    .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1'))
    .pipe(gulp.dest('css'))
    .pipe(rename({suffix: '.min'}))
    .pipe(minifycss())
    .pipe(gulp.dest('css'));
});
 
 并收到此错误输出： 
 
  
 
 我的语法错了吗？ 

I'm following this tutorial to set up gulp.js on Ubuntu. However, when I run gulp styles in the terminal I get the 'TypeError: glob pattern string required' error. I'm a complete gulp noob - could anyone point me in the right direction? 
 
My gulpfile.js file:
 
var gulp = require('gulp'),
    sass = require('gulp-ruby-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    minifycss = require('gulp-minify-css'),
    rename = require('gulp-rename');

gulp.task('styles', function() {
  return gulp.src('sass/*.scss')
    .pipe(sass({ style: 'expanded' }))
    .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1'))
    .pipe(gulp.dest('css'))
    .pipe(rename({suffix: '.min'}))
    .pipe(minifycss())
    .pipe(gulp.dest('css'));
});
 
My file directory:
 
 
Edit:
 
I tried this in my gulp.js file:
 
gulp.task('styles', function () {
    return sass('sass/*.scss', {
      style: 'expanded'
    })
    .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1'))
    .pipe(gulp.dest('css'))
    .pipe(rename({suffix: '.min'}))
    .pipe(minifycss())
    .pipe(gulp.dest('css'));
});
 
and received this error output:
 
 
Is my syntax wrong?

原文：https://stackoverflow.com/questions/34629296